Storage of carbon dioxide on a large scale in oil fields

Government of Canada, 07 / 09 / 2004

EnCana was able to produce more oil when carbon dioxide (CO2) was injected into geological formations and mixed with petroleum. For example, the Weyburn field, operated by Calgary-based company 50 in southeastern Saskatchewan, has stockpiled some five million tonnes of CO2.
A report concludes that the Weyburn oil field is very suitable for long-term storage of CO2 due to its geological characteristics. ENAA (Japan), Nexen, SaskPower, TransAlta and Total (France) participated in a multidisciplinary study, lasting four years, which cost 40 million Canadian dollars. During the study, the researchers carried out a risk assessment of this long-term storage, completed geological and seismic studies, compared environmental modeling with actual results and carried out repeated and frequent samples to try to understand the chemical reactions occurring in The reservoir.
This study proves that one can store 5.000 tonnes of CO2 per day in the soil and thus limit the release of this greenhouse gas in the atmosphere. However, the CO2 used was transported by a 325-kilometer pipeline and came from a North Dakota coal gasification plant. This shows the limits of the project since it remains easier to manufacture CO2 than to trap, store and transport that emitted by polluting activities. In addition, much remains to be done to apply the techniques and systems used here to other geological formations elsewhere in the world and to make CO2 storage truly an option for reducing greenhouse gas emissions. tight.

Read also: Soil that can enhance global warming

Ecology note:
See the order of magnitude of humanity's CO2 emissions:

- current daily consumption is 80 million barrels of oil
- 85% of this oil is consumed in the form of energy (therefore burned)
- 1 kg of burnt oil discharges, envion and to simplify the calculations, 2.5 kg of CO2
- a barrel of oil contains 159 L
- the density of the oil is approximately 800 kg / m3

So there is 80 * 0.85 * 159 * 0.8 = 8650 Million kilograms of oil burned daily.
Hence the CO2 emissions of: 8650 * 2.5 = 21 Million kg… or 600 Million Tons.

It would be interesting to compare this figure with the daily absorption of CO2 from the biomass (mainly plants and plankton).

Obviously, this figure only takes into account the discharges of oil, in no way the CO2 emissions of other fossil fuels (gas and coal). The "large scale" mentioned in the title is therefore not very credible ... for now.

Read also: Respiratory toxicity of diesel particles

Wouldn't a more effective solution simply reduce oil consumption? By increasing the process conversion efficiency… for example.

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